Stadium: Court 4 Round: 62 Ground: Clay
| ITF - M15 Meerbusch | 2024/04/22 16:00 | Mitchell Harper v Julius Seifert | 4-6,4-6 |
| ITF - M15 Meerbusch | 2024/04/21 13:30 | Vojtech Mares v Julius Seifert | 5-7,4-6 |
| Challenger - Luedenscheid | 2021/08/15 14:10 | Jonas Forejtek v Julius Seifert | 6-2,6-1 |
| ITF - M15 Meerbusch | 2024/04/22 15:45 | Daniel Leong Prickett v Ruben Hartig | 1-6,6-4,9-11 |
| ITF - M25 Hammamet | 2024/04/15 08:30 | Ruben Hartig v Jeffrey Hsu | 0-6,6-7 |
| ITF - M15 Rovinj | 2024/03/11 08:30 | Ruben Hartig v Lorenzo Vatteroni | 1-6,0-6 |
| ITF - M15 Poreč | 2024/03/03 10:00 | Stepan Baum v Ruben Hartig | 6-1,1-6,12-10 |
| ITF - M25 Hammamet | 2024/02/12 08:30 | Daniel Bagnolini v Ruben Hartig | 6-3,6-0 |
| ITF - M15 - Antalya | 2023/12/17 07:00 | Hien Q H Pham v Ruben Hartig | 6-4,7-6 |
| ITF - M15 - Antalya | 2023/12/10 07:00 | Pablo Roche Alcaya v Ruben Hartig | 7-6,6-3 |
| Majstrovstvá Nemecka | 2023/12/03 16:00 | Sebastian Gampert v Ruben Hartig | 6-2,6-3 |